This is the mail archive of the mailing list for the glibc project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] powerpc: Only enable TLE with PPC_FEATURE2_HTM_NOSC

Hi Adhemerval,

On 08/28/2018 08:48 AM, Adhemerval Zanella wrote:
> On 27/08/2018 19:44, Tulio Magno Quites Machado Filho wrote:
>> Adhemerval Zanella <> writes:


>> Can't ABORT_TRANSACTION check for PPC_FEATURE2_HTM_NOSC in tcbhead_t.hwcap and
>> continue to support older Linux versions?
> I don't have a strong opinion here, but chatting with Breno I had the impression
> that TLE (and HTM in general) is only used on kernel with this recent fix. This
> patch is really a hack insertion that penalizes all syscall for an specific
> feature which may not be present in the kernel.

In fact, it is more than a penalization (which is also there). The current
design seems to be incoherent with the Kernel design[1] and limiting the
feature usage. By the kernel design, a syscall executed inside a suspended
transaction is allowed, as said by the kernel documentation[1]:

 "Syscalls made from within a suspended transaction are performed as normal and
  the transaction is not explicitly doomed by the kernel"

The statement above becomes invalid if the syscall is performed through glibc
nowadays, which I understand is an undesired behavior.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]